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mum. I 2 Sheets'Sheet 1.

A. VANDERBBEK' 8; L. G. WORRON.-

" DRILLING MACHINE.

No 504,289. v Patented Aug. 29,1893.

(No Model.) 4 2 Shets-Sheet 2-; "A; VANDEBBEEK & L. G. WORRON.

DRILLING MAGHINE.

No. 504,289. "Pateiated Aug 29,1893.

Units TATES ABRAHAM VANDERBEEK AND LEWIS O. WORRON, OF HARTFORD, CON-NEOTICUT, ASSIGNORS TO SAID VANDERBEEK.

DRILLING- SPECIFICATION forming part of Letters Patent No. 504,289,dated August 29, 1893.

Application filed June 15, 1893.

To all whom it may concern:

Be it known that we, ABRAHAM VANDER- BEEK and LEWIS G. WORRON, citizensof the United States, residing at Hartford, in the county of Hartfordand State of Connecticut, have invented an Improvement in Drilling-Machines, of which the following is a specification.

In the present improvementa fixed column is made use of, supporting ahead that may be rotated to bring into position and action one ofseveral tools standing in a circle and a revolving shaft is in thestanding column, eccentric to the same with a friction wheel on theupper end that comes into contact with the pulley of the drill to bepropelled and is out of contact with all the wheels and other pulleys;and the countershaft for driving the apparatus is in the base, providedwith aface wheel, and there is a friction pinion upon the Verticalshaft, such friction pinion being slid upon the vertical shaft by theaction of peculiar treadles so as to bring the friction pinion nearer toor farther from the axis of rotation of the face wheel, therebyincreasing or lessening the speed of the drill.

In the drawings, Figure 1 is a vertical section of the drilling machine.Fig. 2 is aplan View of the upper portion of the same. Fig. 3 is asectional plan of the treadle mechanism at the line y y of Fig. 1. Fig.4 is a horizontal section through the bearing of the vertical drivingshaft, and Fig. 5 is a vertical section of the pinion and collar at thelower portion of the vertical driving shaft. The machine is supported ona suitable base A upon which is the box B forming the base of the hollowcolumn 0, and there isa shoulder at 2 around the upper part of thecolumn upon which rests the drill head D that is provided with acircular range of vertical spin dles E or tool holders, and the head maybe rotated to bring either of the spindles into position for use, andthere is a bolt 3 that passes up into one of the recesses in the lowerpart of the drill head for holding such head when it has been revolvedto bring the proper tool into position, and from the bolt 3 a rod 4extends to a lever 5 by which the bolt can be engaged or disengaged. Itis preferable to employ a bolt that is raised by a spring as Serial No.477,746- (No model.)

this shaft F is a friction pinion H, the edge of which is against thesurface of the disk I upon the shaft K which receives rotary movementfrom any suitable device such as the belt pulley L, and there is a keyor feather for connecting the pinion H with the shaft K and upon whichkey or feather such pinion can be raised or lowered to bring it nearerto or farther from the axis of the disk Iand hence to increase or lessenthe speed with which the shaft F is rotated iurelation to the counter ordriving shaft K.

The counter or driving shaft K is supported by a bearing M upon the baseA, and said bearing can be slid radially toward or from the verticalshaft F, and we make use of a screw N to act upon the bearing M to pressthe same and the disk I toward the friction pinion H with the desiredforce for insuring the proper driving of the pinion 1-1 by the frictiontherewith of the disk I.

The collar 0 is connected with the friction pinion I-I so that by itsaid pinion -H can be raised or lowered as the shaft is revolved withand by the pinion through the intervention of the key or feather, butthe collar 0 does not revolve and it is connected with the arm P thatextends from the axis or short shaft 6 that is supported by the boxportion or base of the column 0, and the treadle 7 is connected directlywith the arm P and the treadle 8 is on an axis 9, and there aresegmental gears 10 and 11 upon the respective parts and the treadle 8connected with the segmental gear 11. Hence when the foot is placed uponor against the treadle 7 the arm P moves the collar 0 and the frictionpinion H upwardly and nearer to the periphery of the friction wheel ordisk I, and when the foot is placed upon the treadle 8 it actsthroughthe gear 11 upon the segmental gear 10 to move the arm P and thecollar 0 downwardly and draw the friction pinion H downwardly and nearerto the axis of rotation of the disk I. By this means the speed ofrotation of the disk I and vertical shaft F can be regulated; and weremark that it is advantageous to employ rings of leather clampedtogether to form the friction pinion H, so that the edges of these ringsbeing in contact with the friction disk I re ceive rotation from thesame.

At the upper end of the vertical shaft F there is a friction wheel Q,preferably having a surface or edge of rings of leather clamped togetherand upon each drill spindle is a friction pinion or wheel R, and theshaft F being eccentric to the column 0 the wheel Q is in such aposition as only to come into contact with and to drive one of thefriction pinions or wheels R, as represented in Figs. 1 and 2 and inorder to compensate for wear and to cause the wheel Q to press with thenecessary force against thewheel R that is to be driven for rotating thesame, the spindle and the tool held by the spindle, we employ anadjustable bearing for the upper part of the shaft within the column,such bearing being composed of the box 14 having an inclined side withwhich the wedge 15 comes into contact, and it is advantageous to havethe box 14 supported by a bearing S within the upper part of the column,and the wedge 15 is suspended and moved vertically by the screw 16, andthe surface of the wedge 15 that is in contact with the bearing S isdovetailed to connect the parts and allow of the vertical movement of ofthe wedge, and so also is the wedge 15 dovetailed with the box 14, andthere is a space between the opposite edge of the box 14 and the insideof the column that allows for the parts to beadj usted by raising orlowering the wedge 15 by the screw 16, andin so doing the box 14: ismoved in one direction or the other and the friction between the wheel Qand the wheel or pinion R can be regulated with facility.

It is advantageous to employ a table or bearing plate T carrying thearticle to be bored, and there is an arm U having an eye that surroundsthe column 0 and on which column the arm can be raised or lowered andclamped so as to vary the height of the bearing plate and the proximityof the article to the spindle and the tool carried by the spindle. Eachspindle E is movable vertically by any suitble device such as a rack 17,pinion 18 and lever 19 acting upon the sleeve 20 surrounding the lowerpart of the spindle and forming a box or hearing for the same, and thespindle slides through the friction wheel R, there being a spline orfeather to cause the wheel R to give motion to the spindle as it isdriven by the wheel Q; and each spring V is fastened at one end 21 uponthe surface of the head and within the semi-circular recess formed forthe reception of such spring V, and the other end of the spring Visconnected to the sleeve 20, and when the sleeve 20 is in an elevatedposition the exterior surface of the spring V rests against theinterior, or curved surface of the arm, and as the spindle is drawn downthe active portion of the spring V is gradually lengthened by the end ofthe ing operation the eflective lengths of the springs Vincrease and itsflexibility is correspondingly augmented by being pulled away from itsbearing against the surface of the head D. By this means we are enabledto employ a flexible spring that is suliiciently stiff when the spindleis raised for holding the same in position and which is sufficientlylong for practical use when the spring 1s strained by the spindle beingmoved downwardly to its extreme point.

We claim as our invention-- 1. The combination with the column and itsvertical eccentrically located shaft, of a countershaft and frictiondisk, a friction pinion upon the vertical shaft capable of being raisedand lowered upon a feather or spline, a collar connected with thepinion, a lever and treadle for acting upon the collar to raise thepinion, and a second lever and intermediate gear segments for actingupon the lever and collar to draw down the pinion and lessen the speed,substantially as set forth.

2. The combination in a drilling machine, of a vertical column and ashaft within the same, a friction pinion movable up and down upon suchshaft, a disk for rotating the pinion, a countershaft for such disk anda hearing carrying the countershaft and movable upon the base of thecolumn, and a screw for applying the pressure and friction between therevolving disk and the pinion, substantially as set forth.

3. The combination in a drilling machine, of a column, aneccentricallylocated shaft within the column, means for driving thesame, a drill head supported by the column and capable of being rotated,a circular range of vertical spindles carried by the drill head,friction wheels upon the respective spindles, and a friction wheel uponthe eccentrically located vertical shaft coming into contact and drivingthe spindle which is in position for use, anda movable bearing for theupper end of the eccentric shaft for applying friction between the wheelupon the upper end of the vertical shaft and the wheel upon the spindleghat is being rotated, substantially as set fort at. The combinationwith the circular range of vertical spindles, of a head carrying suchspindles, a supporting column for such head, there being concavesurfaces upon the exterior of the revolving head and springs within suchconcave surfaces, means for permanently attaching the springs at oneend, and connections from the other ends of the sleeves to end to thehead and resting against the concave surface, the other end of thesprlng being connected with the sleeve, and means for raising andlowering the sleeve and the spindle, substantially as set forth.

Signed by us this 10th day of June, 1893.

ABM. VANDERBEEK. L. o. WORRON.

Witnesses:

DANIEL P. BECKWITH, W. L. GRIsWoLD.

